fix(lib/core): Allow Cache-Key deletion with NULL

Author: fthomys

doc/100-General/10-Changelog.md

@@ -19,6 +19,7 @@ Released closed milestones can be found on [GitHub](https://github.com/Icinga/ic
 
 * [#814](https://github.com/Icinga/icinga-powershell-framework/pull/814) Fixes random chars function to truly generate unpredictable character sequences and to replace `Get-Random` which is not entirely secure
 * [#815](https://github.com/Icinga/icinga-powershell-framework/pull/815) Fixes a possible crash for `Test-IcingaAddTypeExist`, causing the Icinga for Windows installation to fail when third party components are checked which are malfunctioning
+* [#829](https://github.com/Icinga/icinga-powershell-framework/pull/829) Fixes `Set-IcingaCacheData` to properly remove cache files in case `$null` is passed as value
 
 ## 1.13.3 (2025-05-08)
 

lib/core/cache/Set-IcingaCacheData.psm1

@@ -38,6 +38,16 @@ function Set-IcingaCacheData()
     $CacheTmpFile = [string]::Format('{0}.tmp', $CacheFile);
     $cacheData    = @{ };
 
+    if ($null -eq $Value) {
+        if (Test-Path $CacheTmpFile) {
+            Remove-ItemSecure -Path $CacheTmpFile -Retries 5 -Force | Out-Null;
+        }
+        if (Test-Path $CacheFile) {
+            Remove-ItemSecure -Path $CacheFile -Retries 5 -Force | Out-Null;
+        }
+        return;
+    }
+
     if ((Test-IcingaCacheDataTempFile -Space $Space -CacheStore $CacheStore -KeyName $KeyName)) {
         Copy-IcingaCacheTempFile -CacheFile $CacheFile -CacheTmpFile $CacheTmpFile;
     }